The professor, Yuji Yamada, informed the BBC he was “stunned” when he noticed the essay.

“I had seen such stories written in code, however by no means seen one achieved in aburidashi,” he stated.

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“To inform the reality, I had slightly doubt that the phrases would come out clearly. However once I truly heated the paper over the fuel range in my home, the phrases appeared very clearly and I assumed ‘Properly achieved!’

“I did not hesitate to present the report full marks – though I did not learn it to the very finish as a result of I assumed I ought to depart some a part of the paper unheated, in case the media would someway discover this and take an image.”

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As for the essay itself, Ms Haga stated it had extra fashion than substance.

“I used to be assured that the professor would not less than recognise my efforts to make a artistic essay,” she stated.

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“So I wasn’t actually frightened about getting a foul rating for my essay – although the content material itself was nothing particular.”

Further reporting by the BBC’s Hideharu Tamura in Tokyo

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Media captionThere are only a few ninjas left in Japan, and Mariko Oi has met two of them